Printing device for office use



9, 1955 H. scHNAc EL 2,714,851

PRINTING DEVICE FOR OFFICE-USE Filed June 21, 1951 [i k/ENTER #4 m6 ream/Fake! A fro/M151 United States Patent PRINTING DEVICE FOR OFFICE USE Hans Schnickel, Koln-Lindenthal, Germany, assignor, by mesne assignments, to Peppy Industries, Inc., New York, N. Y., a corporation of New York Application June 21, 1951, Serial No. 232,690

3 Claims. (Cl. 101--329) This invention relates to a printing device, of which preferred embodiments will be described by reference to the accompanying drawing, in which:

Figs. 1 and 2 illustrate a first embodiment, whereof Figure l showsthe printing device in lateral elevation, with one side-wall of the housing taken away.

Fig. 2 is a section along the line AB in Figure l.

Fig. 3 illustrates a second embodiment and is a lateral elevation, with one side-wall of the housing taken away, and

Fig. 4 illustrates a third embodiment and is a lateral elevation, similar to those shown in Figs. 1 and 3.

Fig. 5 shows a detail of the printing cylinder in side view.

The housing of the printing cylinder consists of sides 1 and 2 and a top piece 3. According to the embodiment shown in Figs. 1 and 2, a printing cylinder 9 is rotatably mounted upon a cylindrical axle 4, the ends thereof are flat and for short vertical movements slidably mounted on inner walls fastened to the housing. The printing roller 9 has elastic hoop rings 26, which are preferably toothed and protrude with their outer circumferences beyond the printing surface of the rubber stereotype 27, such as shown in Fig. 2. Yokes 17 and 18 are laterally inserted into the axle 4. In between the arms tension springs 14 and 16 are wound around the axle 4. The bent ends of the tension springs 14 and 16 extend crosswise around the yokes 17 and 18 and also around a pin 19 fixed as shown in Figures 1 and 2 in the printing cylinder 9. The pressure exerted by the ends of the tension springs 14 and 16 return the cylinder 9 after it has been rolled off in one of two directions back to its initial position. Pins 5 and 6 are mounted to the ends of the axle 4, pressure springs 7 are wound around the pins; the springs abut on one side against the ends of this axle and on the opposite side against a yoke 8 mounted at the ends of the pins. The ends of the yokes 8 support one end of pivoting levers and 11, which are supported at 12 and 13 on each side of the housing. The other or lower ends of the pivoting levers engage the axles 21 of the ink rollers 20, which are supported in guide slots 41 and 42 of the inner walls 39 and 40. The ink rollers 20 are biased, normally at moderate pressure, by spring pressure towards the printing roller 9. However, this pressure is increased during the printing operation, when the printing cylinder is pushed backwards, whereby the pressure upon the ink rollers towards the printing cylinder is increased. 22 and 23 indicate the lateral closing walls of the printing cylinder 9.

The ink roller 20 is comprised of cylindrical ink-pads 28, which are removably fixed by tight fits upon the axle 21, and clamped in-between partition-disks 29, similarly fixed upon the same axle 21 as said pads. If the stereotype is to be reproduced in only one colour, then but one ink pad is required upon each axle 21. The ink rollers may however be easily provided for multi-colour printing, as shown in Fig. 2 of the drawing, in that each axle 21 is being provided with at least two cylindrical ink pads iii) ice

28 with differing inking colours, each of the differently coloured ink-pads being separated by a partition disk S ll. By this arrangement an inexpensive printing device for ofiice use is created, which permits of coloured reproduc tion of the stereotype and if need be also for image plates to enhance any desired effect for advertising purposes;

The flanges 29 and also the intermediary partition disks Sir protrude beyond the ink pad cylinders 28 for about l2 millimeters. This is helpful to hold the ink-pads 28 in strictly fixed position in regard to the printing cylinder 9 to prevent thereby colouring of the toothed hoop-ring 26 and inking in of parts rubber type plate, which do not participate on the printing action.

The hoop-rings 26 are shaped and calculated to prevent unclean and unsharp printing, due to conditions which might arise at the end of the rolling-off movement of the printing cylinder 9. Similarly it is prevented that at the beginning of printing contact any unclean printing may arise. The resiliently inwardly pressed toothed hoopings 26 prevent too great pressure from being exerted at the printing operation upon the rubber-plate or stereotype for printing, enabling sharp and clear reproduction of very small letters and figures.

in the embodiment according to Figure 3, the pivoting levers which are swingabie on the pins i3 and 44 are subjected to the influence of tension springs 25, which are attached to the T-shaped member 24 which itself is seated upon the flattened ends of the slidably mounted axle d. The operation of the remaining parts of this embodiment of a printing device is the same as described in connection with Figure 1.

In the embodiment shown in Figure 4, the pressure springs shown in Figure 1 and the pressure springs shown in Figure 3 are in this case replaced by a leaf spring 38, which serves the same purpose. The leaf spring 38 is connected to the axle 4 and the pivoting levers 45. Moreover, there is a second leaf spring 46 mounted laterally in the axle 4. The ends thereof abut the under-side of projections 4-7, 48 of the inner housing wall. This counter-leaf spring 46 supports the action of the leaf spring 38, in returning the printing cylinder 9 to its initial posi tion. The function of the springs 38 and 46 are correlated to each other.

The form of a printing cylinder shown in Figure 5 has dovetail type recesses 49. Rubber pieces 50 are removably fitted therein. To the free outside surface of 49 the electrotype 51 is glued on and thereby easily exchangeable. Rubber glued to rubber provides for excellent connection and is therefore well suited for mounting of the electrotype upon the cylinder 9.

I claim:

1. A printing device comprising in a casing a printing roller and a horizontal axle to support said printing roller, said axle being vertically movably located. in slots of the inner walls of said casing, tension springs supported on both sides of said printing roller upon said axle and adapted to return said printing roller to its initial position, two coloring rollers horizontally movable in slots of said inner walls and located on opposite sides of said printing roller, T-elenients mounted upon the ends of said axle, pivotable levers connected to said coloring rollers for horizontal movement of the latter, the cross-portion of said T-elements being operatively connected to said pivotable levers for resiliently transmitting vertical movement of said printing roller to said coloring rollers, whereby upon increase of the pressure imparted. to the printing roller during the printing operation, the surface pressure of the coloring rollers upon the printing roller is modified.

2. A printing device comprising in a casing a printing roller and a horizontal axle to support said printing roller, said axle being vertically movably located in slots of the inner walls of said casing, tension springs supported on both sides of said printing roller upon said axle and adapted to return said printing roller into its initial position, two coloring rollers horizontally movable in slots of said inner walls and located on opposite sides of said printing roller, vertical pins mounted upon the ends of said axle, yokes mounted upon the upper ends of said pins, pressure springs wound around said pins between said yokes and said axle and pivotable levers operatively connecting said yokes and the axles of said coloring rollers, whereby upon increase of the pressure imparted to the printing roller during the printing operation, the surface pressure of the coloring rollers upon the printing roller is modified.

3. A printing device comprising in a casing a printing roller and a horizontal axle to support said printing roller, said axle being vertically movably located in slots of the inner walls of said casing, tension springs supported on both sides of said printing roller upon said axle and References Cited in the file of this patent UNITED STATES PATENTS 770,956 Bradley Sept. 27",, 1904 1,364,301 Paxton Jan. 4, 1921 2,299,242 Lui Oct 20, 1942 2,513,419 Mann July 4, 1950 FOREIGN PATENTS 319,481 Great Britain Sept. 26, 1929 

